Lady GaGa has been praised for being "really impressive" in the recording studio.

French DJ Madeon told Digital Spy that the singer gave "everything" during their recording sessions for her upcoming album ARTPOP.

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"She's great. She's a really, really interesting and nice person," Madeon said at the launch of Sony's Xperia Z smartphone in London.

"From a personal standpoint it's been hugely admirational, to be like, 'Wow - you're at this level of super, ultimate fame - and there's this aura of superstardom - and you're still an engaging and nice person'. So that was really humbling."

He added: "Professionally, I think she's amazing. She would come out of a show after singing live for three hours and giving it everything, but just go straight to the studio and record.

"She would still give everything - even on the demo take! She's really impressive."